The Scriptures unmistakably teach that the dead are unconscious in the tomb and will not be awakened until the resurrection morning. The Bible explains about fallen angels – demons – who left their former habitation in heaven, and went contrary to the Divine will, for which they have been restrained in chains of darkness (the darkness of the night) until the judgment time. These have manifested their power all down through the ages with the ability to impersonate the dead and otherwise deceiving mankind. 

Please see the following scriptures and resources below: Exodus 22:18; Deuteronomy 17:9-12; Leviticus 19:31, 20:6; 2 Kings 21:2,6,11; 1 Chronicles 10:13,14; Acts 16:16-18; Galatians 5:10-21; Isaiah 8:19,20; Isaiah 19:3.

Additional Resources:
Christian Questions Podcast
Episode #1305: “How Do Satanic Demons Influence Our World?”
Establishing the origin, power and methods of dark spiritual beings
CQ Rewind Show Notes

Episode #1201: “Can the Dead Communicate With Us?”
Examining after-death communications in the light of Scripture
Preview Video
CQ Rewind Show Notes